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Help please, Agility of Power Series

• To: mathgroup at smc.vnet.net
• Subject: [mg14631] Help please, Agility of Power Series
• From: "Jerry Huang" <hpjerry at cwix.com>
• Date: Wed, 4 Nov 1998 13:47:00 -0500
• Organization: CWIX
• Sender: owner-wri-mathgroup at wolfram.com

IF a f(x)= the summation of nx^n from 1 to infinity

Find the closed form for f(x) by calculating the result of (1+x)*f(x)

It's going to be due
help please
thanks a lot